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ProPublica Congress API

The ProPublica Congress API returns: Roll-call vote data, tracked by official Congressional data sources, Member data for current and past members of Congress, Standard bill summaries and details, Nomination data (exclusive of Military nominations) and various supplemental information, including party counts by state; and committees and committee rosters.
Most of the data in the ProPublica Congress API is updated daily, votes are updated every 30 minutes. Use of this API is available under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 United States license. Commercial users may be subject to additional use fees.
This is a RESTful API, with an API Key Authentication Model.

Note: As of August, 2017, the ProPublica Congress API is a replacement for the Sunlight Labs Congress API.